Pipe-jack.



No. 694,399. Patented Mar. 4, |902.

G'. .1. MAAS.

PIPE JACK.

(Applicatioxi led Dec. 18, 1901.)

(No Model.)

arten Srfrns A'rnNr Orrrcn.

GEORGE J. MAAS, OF NEGAUNEE, MICHIGAN.

PIPE-JACK.

SPECIFICATION formingpart of Letters Patent'No. 694,399, dated March 4, 1902. Application tiled December 16, 1901. Serial lilo. 86,176. (No model.)

T0 all whom it may concern,.-

Be it known that I, GEORG-E J. MAAS, a citizen of the United States, and a resident of Negaunee, in the lcounty of Marquette and State of Michigan, have invented certain new and useful Improvements in Pipe-Jacks; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention has especial reference to jackscrews for pulling pipes from the ground into which they have been driven; and it consists in certain peculiarities of construction and combination of parts, as will be fully set forth hereinafter in connection with the accompanying drawings and subset] uently claimed.

In the said drawings, Figure l is a vertical central sectional View of my improved pipejack, showing also a pipe to be extracted thereby; and Fig. 2 is a broken plan view with the said pipe in section on the line 2 2 of Fig. l.

Referring to the drawings, a represents a suitable base supporting a hollow post b, preferably formed integrally therewith,which post is formed, preferably at its upper end, with an interiorly-screw-threaded .portion c for engagement with the exterior threads* of a 'hollow jack-screw d. This jack-screw is formed with a cap e, having peripheral recesses for Ythe reception of theends of bars ff and an annular groove in its -upper face for,

receiving a ring g of hardened metal, said ring having an annular groove in its upper face for the reception of antifriction balls or rollers 7L 7L. Above the cap e is a clamp-ring 1., having an annular recess in its under surface fitted with an annularl wear-plate j of hardened metal, which rests on the balls 7L h, as shown in Fig. l. This ringe' has a beveled bore, and clamping-Wedges 7c are provided, so that when the jack-screw is set over and around a pipe m, projecting from the ground, these wedges lo are forced between the pipe and the inner wall of the clamp-ring t', thereby firmly holding the pipe to the clampring by frictional contact. The said clampring is formed with peripheral recesses for the reception of bars n n.

The operation of my device will be readily understood from the foregoing description of its construction, taken in connection with the accompanying drawings. In order to loosen the hold of the pipe m in the ground, heavy pressure is brought to bear on the pipe, so as to turn it partially by means of the clampbars n n, which bars serve also to shake the pipe back and forth, and then' by manning one or more of the lower bars ff and Walking around the pipe in the manner of operating a capstan the jack-screw d is raised, carrying with it the clamp-ringe' and the pipe on, clamped thereto, as described, so that the pipe is very quickly and readily pulled from the `ground with the expenditure of but little force.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. In a pipe-jack, the combination with a suitable baseandahollowinteriorly-threaded post supported thereby,of a holloWjack-screw in movable engagement with said post, and a pipe-clam ping device supported by said jackscrew, and kept from contact therewith by interposed antifriction balls or rollers.

8. In a pipe-jack, the combination with a .suitable base and a hollow interiorly-threaded post supported thereby,of ahollow jack-screw in movable engagement with said post, and provided with a cap at its upper end, a clampring supported by said cap; and wedges for clamping said clamp-ring to a pipe projecting therethrough. y

4. In a pipe-jack, the combination with a suitable base, and a hollow interiorly-threaded post supported thereby, of a hollow jackscrew in movable engagement with said post; a flanged cap at the upper end of said jackscrew; bars proj ectin glaterally from said cap; antifriction balls or rollers resting in a groove in the upper' face of said cap; a clamp-ring resting on said balls or rollers and formed with a beveled bore; bars proj ectin glaterall y from said clamp-ring; and wedges for clamping said clamp-ring to a pipe projecting therethrough.

5. In a pipe-jack, a hollow open-ended post adapted to be set over and around a pipe pro- ICO jeoting from the ground; a tubular jack in -ment with said post; a clamp-ring supported by said tubular jack and surrounding said pipe; Wedges for clamping; said ring to the said pipe; and bars projecting from Said clamp-ring, whereby the said pipe may be turned or shaken loose, by the rotary movement of said clamp-ring, and drawn from the ground as the clamp-ring is elevated by the upward vertical movement of the tubular jack.

In testimony that I 'claim the foregoing I have hereunto set my hand, at Negaunee, in the county of Marquette and State of Michigan, in the presence of two witnesses.

' GEORGE J. MAAS.

Witnesses.:

GEO. E. OCoNNoR, THOMAS PAsooE. 

